CN107959533B - Wireless device and radio frequency channel calibration method - Google Patents
Wireless device and radio frequency channel calibration method Download PDFInfo
- Publication number
- CN107959533B CN107959533B CN201610901193.7A CN201610901193A CN107959533B CN 107959533 B CN107959533 B CN 107959533B CN 201610901193 A CN201610901193 A CN 201610901193A CN 107959533 B CN107959533 B CN 107959533B
- Authority
- CN
- China
- Prior art keywords
- radio frequency
- channel
- phase difference
- calibration
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/267—Phased-array testing or checking devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/14—Monitoring; Testing of transmitters for calibration of the whole transmission and reception path, e.g. self-test loop-back
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radio Transmission System (AREA)
Abstract
The embodiment of the invention provides a wireless device and a radio frequency channel calibration method, relates to the technical field of communication, and is used for improving the accuracy of radio frequency channel calibration. The wireless device comprises a first radio frequency module, a second radio frequency module and a processor, wherein the first radio frequency module and the second radio frequency module work in the same frequency band; the first radio frequency module is connected with the calibration antenna and used for sending a calibration signal by using the calibration antenna; the second radio frequency module is connected with the at least two calibrated antennas and used for receiving the calibration signal by each antenna of the at least two calibrated antennas; the second radio frequency module corresponds to at least two radio frequency channels, the at least two radio frequency channels respectively correspond to the at least two calibrated antennas, and the number of the at least two radio frequency channels is the same as that of the at least two calibrated antennas; and the processor is used for determining the device phase difference of each radio frequency channel in the at least two radio frequency channels and calibrating the corresponding radio frequency channel by using the device phase difference of each radio frequency channel in the at least two radio frequency channels.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a wireless device and a radio frequency channel calibration method.
Background
Multiple Input Multiple Output (MIMO) technology refers to the use of multiple antennas by both the transmitter and the receiver. MIMO technology can improve bandwidth without increasing spectrum resources and antenna transmission power.
Due to aging of devices or temperature variation, the phase of signals received by an antenna may be different after passing through a Radio Frequency (RF) channel composed of a plurality of devices. Signals with different phases result in an inaccurate measurement of the angle of arrival (AOA). There is therefore a need for calibration of the radio frequency channel.
At present, when calibrating the radio frequency channel, the radio frequency channel is usually calibrated by using a dedicated hardware calibration instrument such as a signal generator and a spectrometer before the equipment is shipped. The phase of the rf channel may be different due to aging of the device or temperature change after the device leaves the factory.
Disclosure of Invention
The application provides a wireless device and a radio frequency channel calibration method, which solve the problem that the phases of radio frequency channels are different due to device aging or temperature change and the like.
In a first aspect, a wireless device is provided, where the wireless device includes a first radio frequency module, a second radio frequency module, and a processor, and the first radio frequency module and the second radio frequency module operate in the same frequency band; the first radio frequency module is connected with the calibration antenna and used for sending a calibration signal by using the calibration antenna; the second radio frequency module is connected with the at least two calibrated antennas and used for receiving the calibration signals by each antenna of the at least two calibrated antennas, wherein the second radio frequency module corresponds to at least two radio frequency channels, the at least two radio frequency channels respectively correspond to the at least two calibrated antennas, and the number of the at least two radio frequency channels is the same as that of the at least two calibrated antennas; and the processor is used for determining the device phase difference of each of the at least two radio frequency channels and calibrating the corresponding radio frequency channel by using the device phase difference of each of the at least two radio frequency channels, wherein the device phase difference is a difference value between a receiving phase difference and a distance phase difference of the corresponding radio frequency channel, the receiving phase difference of the corresponding radio frequency channel is a phase difference between the calibration signal received by the corresponding radio frequency channel and the calibration signal received by the reference radio frequency channel, the distance phase difference of the corresponding radio frequency channel is a phase difference based on the distance difference of the corresponding radio frequency channel and the channel of the calibration signal, and the distance difference of the corresponding radio frequency channel is a difference value between the calibrated antenna corresponding to the corresponding radio frequency channel and the calibration antenna and between the calibrated antenna corresponding to the reference radio frequency channel and the calibration antenna. In the above technical solution, one of the plurality of radio frequency modules of the wireless device is used to calibrate the radio frequency channel corresponding to the other radio frequency module, and calibration before delivery is not limited. When the calibration is not carried out, the wireless device can normally communicate by using the plurality of radio frequency modules, and the complexity of the wireless device is not increased. When the radio frequency channel is calibrated, the influence of the difference of the distance between the antenna and the antenna on the phase is considered, and the calibration accuracy is improved.
In a possible implementation manner, the processor is further configured to switch a channel in which the first radio frequency module and/or the second radio frequency module operate, where a frequency band in which the first radio frequency module and the second radio frequency module operate includes a plurality of channels. When the radio frequency channel works in different channels of the same frequency band, the phase difference is slight. Although it is also feasible to calibrate the rf channels operating in other channels with the data obtained from the calibration when the rf channels operate in a single channel, calibrating the rf channels separately in a plurality of different channels may further improve the accuracy of the calibration.
In one possible implementation, the processor is a baseband chip or a central processing unit. In the above optional technical solution, the wireless device realizes phase calibration of the radio frequency channel through a baseband chip or a central processing unit.
In one possible implementation, the wireless device includes a plurality of second radio frequency modules. Each of the plurality of second rf modules may be configured to receive the calibration signal transmitted by the first rf module. Calibrating multiple rf modules at once can improve the efficiency of rf channel calibration.
In a second aspect, a radio frequency channel calibration method is provided, the method including: a first radio frequency module of the wireless device sends a calibration signal by using a calibration antenna; a second radio frequency module of the wireless device receives calibration signals by using at least two calibrated antennas, wherein the second radio frequency module corresponds to at least two radio frequency channels, the at least two radio frequency channels respectively correspond to at least two calibrated antennas, the calibration antennas and the at least two calibrated antennas are located in the wireless device, and the number of the at least two radio frequency channels is the same as that of the at least two calibrated antennas; the wireless equipment determines a device phase difference of each radio frequency channel in at least two radio frequency channels, wherein the device phase difference is a difference value between a receiving phase difference and a distance phase difference of a corresponding radio frequency channel, the receiving phase difference of the corresponding radio frequency channel is a phase difference between a calibration signal received by the corresponding radio frequency channel and a calibration signal received by a reference radio frequency channel, the distance phase difference of the corresponding radio frequency channel is a phase difference based on a distance difference of the corresponding radio frequency channel and a channel of the calibration signal, and the distance difference of the corresponding radio frequency channel is a difference value between a distance from a calibrated antenna corresponding to the corresponding radio frequency channel to the calibration antenna and a distance from the calibrated antenna corresponding to the reference radio frequency channel to the calibration antenna.
In one possible implementation, the method further includes: the wireless equipment switches channels of the first radio frequency module and the second radio frequency module; the frequency band in which the first radio frequency module and the second radio frequency module operate includes a plurality of channels.
In one possible implementation, the wireless device includes a plurality of second radio frequency modules, and after the first radio frequency module of the wireless device transmits the calibration signal by using the calibration antenna, the method further includes: each radio frequency module in the plurality of second radio frequency modules receives the calibration signal by using at least two calibrated antennas, and each radio frequency module corresponds to at least two radio frequency channels; the wireless equipment determines the device phase difference of each radio frequency channel in at least two radio frequency channels corresponding to each radio frequency module; the wireless equipment uses the device phase difference of each radio frequency channel in at least two radio frequency channels corresponding to each radio frequency module to calibrate the corresponding radio frequency channel. In the above optional technical solution, each radio frequency module in the plurality of second radio frequency modules included in the wireless device may receive the calibration signal sent by the first radio frequency module, so that the efficiency of calibrating the radio frequency channels may be improved by calibrating the plurality of radio frequency modules at one time.
In a possible implementation manner, the device may further calibrate the radio frequency channels in all channels after switching channels of the first radio frequency module and/or the second radio frequency module, so that device phase differences of the radio frequency channels in different channels may be stored. For example, the correspondence between the channel, the rf channel, and the device phase difference is stored, and may be used to perform phase calibration on the rf channel. For example, when the device is located in a certain channel, the device may directly query the correspondence between the channel, the radio frequency channel, and the device phase difference to perform channel calibration, so that the time for channel calibration may be saved.
In a possible implementation manner, the device may also update the stored correspondence between the channel, the radio frequency channel, and the device phase difference every preset period, thereby ensuring the real-time performance and accuracy of the channel calibration.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wireless device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a radio frequency channel corresponding to a radio frequency module according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a radio frequency channel calibration method according to an embodiment of the present invention.
Detailed Description
Before describing the present invention, technical terms related to the present application will be described.
A radio frequency module, also referred to as a radio frequency circuit, may be used to connect the antenna to one or more antennas. Optionally, the rf module includes, but is not limited to, a filter, a Low Noise Amplifier (LNA), an analog-to-digital/digital-to-analog (a/D or D/a) converter, and the like.
Frequency bands and channels, both used to represent spectrum resources. A frequency band typically includes multiple channels. For example, a 2.4 gigahertz (GHz) frequency band may include 14 channels.
The radio frequency channel is a channel for signal transceiving, which includes an antenna and a radio frequency module, and one antenna corresponds to one radio frequency channel in the signal transceiving process.
Fig. 1 shows a schematic structural diagram of a communication system applied in an embodiment of the present invention, where the communication system includes a wireless device 101 and a User Equipment (UE) 102, and the UE 102 may include one or more UEs, such as UE1, UE2, and UE3 shown in fig. 1.
The wireless device 101 may be an Access Point (AP) in a wireless local area network. In embodiments of the present invention, the wireless device 101 may include a plurality of rf modules, each of which may be connected to one or more antennas.
Fig. 2 is a schematic structural diagram of a wireless device according to an embodiment of the present invention, and as shown in fig. 2, the wireless device includes a first radio frequency module 201, a second radio frequency module 202, and a processor 203, and operating frequency bands of the first radio frequency module 201 and the second radio frequency module 202 are the same. The second rf module 202 corresponds to at least two rf channels, the at least two rf channels respectively correspond to at least two calibrated antennas, and the number of the at least two rf channels is the same as that of the at least two calibrated antennas.
The at least two radio frequency channels corresponding to a single radio frequency module and the at least two calibrated antennas are the same in number, which means a corresponding relationship between the at least two radio frequency channels and the at least two calibrated antennas, and the corresponding relationship may be one-to-one correspondence, that is, one radio frequency channel corresponds to one calibrated antenna, and one calibrated antenna corresponds to one radio frequency channel.
Fig. 3 is a schematic structural diagram of the rf module. The rf module shown in fig. 3 corresponds to three rf channels. The rf module may be the first rf module 201 in fig. 2, or may be the second rf module 202. Taking the second rf module 202 as an example, the three rf channels correspond to three calibrated antennas connected to the second rf module 202 one by one. For example, each rf channel in fig. 3 may include an antenna, a filter, an LNA, an a/D converter, and the like corresponding to the rf channel.
The first rf module 201 is connected to a calibration antenna, and configured to send a calibration signal through the calibration antenna. The second rf module 202 receives the calibration signal with at least two calibrated antennas.
The first rf module 201 may be connected to one antenna or may be connected to a plurality of antennas. When the first rf module 201 is connected to an antenna, the antenna can be used as a calibration antenna, and the first rf module 201 can send a calibration signal through the antenna, where the calibration signal can be sent through a channel in which the first rf module operates. When the first rf module 201 is connected to multiple antennas, any one of the multiple antennas may be used as a calibration antenna, and the first rf module 201 is configured to transmit a calibration signal using only the calibration antenna. When the first rf module 201 transmits the calibration signal using the calibration antenna, the second rf module 202 receives the calibration signal using the plurality of antennas. For example, the second rf module 202 is configured in a full antenna receive mode. In the full antenna receive mode, the second rf module 202 receives the calibration signal with all antennas to which it is connected.
The processor 203 is configured to determine a device phase difference of each of the at least two radio frequency channels, and calibrate the corresponding radio frequency channel by using the device phase difference of each of the at least two radio frequency channels. The device phase difference is a difference value between a receiving phase difference and a distance phase difference of a corresponding radio frequency channel, the receiving phase difference of the corresponding radio frequency channel is a phase difference between a calibration signal received by the corresponding radio frequency channel and a calibration signal received by a reference radio frequency channel, the distance phase difference of the corresponding radio frequency channel is a phase difference between a distance difference based on the corresponding radio frequency channel and a channel of the calibration signal, and the distance difference of the corresponding radio frequency channel is a difference value between a distance from a calibrated antenna connected with the corresponding radio frequency channel to the calibration antenna and a distance from the calibrated antenna connected with the reference radio frequency channel to the calibration antenna.
The processor may be a baseband chip or a central processing unit. When the processing module is a baseband chip, the baseband chip can be directly integrated in the radio frequency module. For example, the baseband chip is integrated in the second rf module 202, so that the second rf module 202 determines the device phase difference of each of the at least two rf channels, and the device phase difference of each of the at least two rf channels is used to calibrate the corresponding rf channel.
The wireless device may include a plurality of rf modules, and the plurality of rf modules may be used for data transmission and reception, or for calibration of an rf channel, and are not dedicated to calibration of an rf channel. When performing rf channel calibration, the first rf module 201 may be referred to as an auxiliary calibration rf module, the second rf module 202 may be referred to as a calibrated rf module, and the auxiliary calibration rf module and the calibrated rf module are rf module partitions performed in function when performing rf channel calibration. In practical applications, any one of the rf modules included in the wireless device has different functions during different calibration procedures. For example, in a calibration process, the first rf module 201 may serve as an auxiliary calibration rf module, and the second rf module 202 may serve as a calibrated rf module; in another calibration process, the first rf module 201 may also serve as a calibrated rf module, and the second rf module 202 may serve as an auxiliary calibrated rf module.
Further, the processing module 203 is further configured to switch a channel in which the first radio frequency module and/or the second radio frequency module operate, where a frequency band in which the first radio frequency module and the second radio frequency module operate includes a plurality of channels.
Specifically, the processor 203 may switch a channel of any one of the first radio frequency module 201 and the second radio frequency module 202, may also switch channels in which the first radio frequency module 201 and the second radio frequency module 202 operate simultaneously, and may switch channels in which the first radio frequency module 201 and the second radio frequency module 202 operate to the same channel, or may switch to different channels. When the radio frequency channel works in different channels of the same frequency band, the phase difference is slight. Although it is also feasible to calibrate the rf channels operating in other channels with the data obtained from the calibration when the rf channels operate in a single channel, calibrating the rf channels separately in a plurality of different channels may further improve the accuracy of the calibration.
In addition, the second rf module 202 may include a plurality of rf modules, and the rf modules and the first rf module 201 operate in the same frequency band. When the second rf module 202 is calibrated, multiple rf modules may be calibrated at the same time, so that the efficiency of calibrating multiple rf modules at a time may be improved.
Optionally, in order to improve the accuracy of the calibration of the radio frequency channel and reduce the signal interference between the antennas, the calibration antenna connected to the first radio frequency module 201 and the at least two calibrated antennas connected to the second radio frequency module 202 may be not in the same straight line. For example, as shown in fig. 2, the calibration antenna connected to the first rf module 201 and the 3 calibrated antennas connected to the second rf module 202 are not in the same straight line, and the distances between the calibration antenna and the 3 calibrated antennas are d1、d2And d3。
Optionally, in order to increase the receiving power of each of the at least two calibrated antennas connected to the second radio frequency module 202 for the calibration signal, the polarization direction of the calibration antenna connected to the first radio frequency module 201 and the polarization direction of the at least two calibrated antennas connected to the second radio frequency module 202 may be the same.
Further, when the wireless device calibrates the rf channel in a certain frequency band, the distance D between at least two calibrated antennas connected to the second rf module 202 may be greater than or equal to one half of the wavelength according to the wavelength corresponding to the center frequency of the operating channel of the second rf module 202. Preferably, the distance D between at least two calibrated antennas is equal to one half of the wavelength.
In the wireless device provided by the embodiment of the invention, one radio frequency module in a plurality of radio frequency modules of the wireless device is used for calibrating a radio frequency channel corresponding to another radio frequency module, and calibration can be performed before delivery. When the calibration is not carried out, the wireless device can normally communicate by using the plurality of radio frequency modules, and the complexity of the wireless device is not increased. When the radio frequency channel is calibrated, the influence of the difference of the distance between the antenna and the antenna on the phase is considered, and the calibration accuracy is improved.
Fig. 4 is a flowchart of a radio frequency channel calibration method applied to a wireless device according to an embodiment of the present invention, and referring to fig. 4, the method includes the following steps.
Step 301: a first radio frequency module of the wireless device transmits a calibration signal with a calibration antenna.
Step 302: the second radio frequency module of the wireless device receives the calibration signal with at least two calibrated antennas. The second radio frequency module corresponds to at least two radio frequency channels, the at least two radio frequency channels correspond to the at least two calibrated antennas respectively, the calibration antennas and the at least two calibrated antennas are located in the wireless device, and the number of the at least two radio frequency channels is the same as that of the at least two calibrated antennas.
Step 303: the wireless device determines a device phase difference for each of at least two radio frequency channels. The device phase difference is a difference value between a receiving phase difference and a distance phase difference of a corresponding radio frequency channel, the receiving phase difference of the corresponding radio frequency channel is a phase difference between a calibration signal received by the corresponding radio frequency channel and a calibration signal received by a reference radio frequency channel, the distance phase difference of the corresponding radio frequency channel is a phase difference between a distance difference based on the corresponding radio frequency channel and a channel of the calibration signal, and the distance difference of the corresponding radio frequency channel is a difference value between a distance from a calibrated antenna corresponding to the corresponding radio frequency channel to the calibration antenna and a distance from the calibrated antenna corresponding to the reference radio frequency channel to the calibration antenna.
Specifically, the distance phase difference of the corresponding radio frequency channel may be determined by the following method: for the ith antenna in the at least two calibrated antennas, determining the transmission distance difference between the ith antenna and the (i-1) th antenna according to the distance between the calibration antenna and the (i-1) th antenna in the at least two calibrated antennas and the distance between the calibration antenna and the ith antenna, wherein i is more than or equal to 2; and determining the distance phase difference of the radio frequency channel corresponding to the ith antenna according to the center frequency and the transmitting distance difference, thereby obtaining the distance phase difference of each radio frequency channel in at least two radio frequency channels corresponding to the at least two calibrated antennas.
For the radio frequency channel corresponding to the ith antenna in the at least two calibrated antennas, according to the central frequency f and the distance d between the calibration antenna and the (i-1) th antennaiAnd the distance d between the calibration antenna and the ith antennai-1Determining the distance phase difference of a radio frequency channel corresponding to the ith antenna through a formula (1); wherein c is the speed of light and λ is the wavelength;
therefore, when the number of the at least two calibrated antennas is a, the determined distance phase difference of the at least two radio frequency channels can be expressed as
For example, as shown in fig. 2, the at least two calibrated antennas include 3 antennas, and the distance d between the 3 antennas and the auxiliary calibration antenna1Is 7cm, d2Is 8.7cm, d311cm, if the wavelength corresponding to the center frequency is 5.5cm, the distance phase difference of at least two radio frequency channels determined according to the above formula (1) is {1.9, 2.4}, which can also be expressed as {109 °, 138 ° }.
Since the position of each antenna of the wireless device is fixed, the distance between each antenna is also fixed. The distance between the antennas can be obtained in design or production. Therefore, the distance between the antennas is stored in the wireless device in advance, and the distance phase difference caused by the distance difference between different antenna pairs is calculated according to the distance between the antennas and the frequency (or wavelength) of the working channel of the radio frequency module during calibration. Alternatively, the wireless device stores in advance a distance phase difference calculated from the distance between the antennas and the frequency (or wavelength) of each channel. When the radio frequency channel is calibrated, the wireless device can directly obtain the distance phase difference of the corresponding radio frequency channel according to the working channel of the radio frequency module.
Specifically, the receiving phase difference of the corresponding radio frequency channel may be determined by the following method: and for the ith antenna in the at least two antennas, determining the receiving phase difference of the radio frequency channel corresponding to the ith antenna according to the calibration signal received by the (i-1) th antenna and the calibration signal received by the ith antenna. The receiving phase difference of the radio frequency channel corresponding to the ith antenna may be a difference between a phase of the calibration signal received by the ith antenna and a phase of the calibration signal received by the (i-1) th antenna. The difference may be a phase difference determined according to a calibration signal received once, or an average value of phase differences determined according to calibration signals received multiple times, so as to obtain a receiving phase difference of each of at least two radio frequency channels corresponding to the at least two calibrated antennas.
For example, as shown in fig. 3, if the at least two calibrated antennas include 3 antennas receiving calibration signals CS1, CS2, and CS3, respectively, the receiving phase difference of each of the at least two rf channels is determined as
Specifically, when the wireless device determines the device phase difference of each of the at least two radio frequency channels, for an ith antenna of the at least two calibrated antennas, the wireless device subtracts the corresponding distance phase difference from the receiving phase difference of the radio frequency channel corresponding to the ith antenna to obtain the device phase difference of the radio frequency channel corresponding to the ith antenna, so that the device phase difference of each of the at least two radio frequency channels can be obtained.
The wireless device is phase calibrated with respect to the signal received by the first antenna. Therefore, the calibration phase corresponding to the first antenna is zero. Alternatively, any one of the at least two antennas may be used as a reference for phase calibration.
Step 304: the wireless device uses the device phase difference of each radio frequency channel in at least two radio frequency channels to calibrate the corresponding radio frequency channel.
Specifically, when the wireless device determines a device phase difference of each of the at least two radio frequency channels, the wireless device may perform phase calibration on each of the at least two radio frequency channels according to the device phase difference.
Further, the method further comprises: the wireless device switches the channels in which the first radio frequency module and/or the second radio frequency module operate, and calibrates the radio frequency channels under different channels according to the radio frequency channel calibration method described in steps 301 to 304.
When the wireless device calibrates the radio frequency channels under different channels according to the above method to obtain the device phase difference of each radio frequency channel under different channels, the wireless device may store the device phase difference of each radio frequency channel under different channels, for example, in the correspondence between the channels, the radio frequency channels, and the device phase differences shown in table 1 below. When the wireless device needs to calibrate the radio frequency channels again in the following process, the wireless device may not need to determine the device phase difference corresponding to each radio frequency channel according to the steps from 301 to 303, but directly obtain the device phase difference corresponding to each radio frequency channel from the stored corresponding relationship according to the channel and the radio frequency channel to be calibrated, and calibrate each radio frequency channel based on the obtained device phase difference of each radio frequency channel, so that the calibration speed of each radio frequency channel can be increased.
TABLE 1
The correspondence between the channels, the radio frequency channels and the device phase differences shown in table 1 is only exemplary, and table 1 does not limit the embodiments of the present invention.
Further, when the device phase difference of each corresponding radio frequency channel is obtained according to the corresponding relationship among the channel, the radio frequency channel and the device phase difference, and the radio frequency channel is calibrated, in order to ensure the real-time performance and accuracy of the channel calibration, the wireless device may also periodically update the corresponding relationship among the channel, the radio frequency channel and the device phase difference. Namely, according to the steps of step 301 and step 304, the corresponding relationship between the device phase differences corresponding to each rf channel is re-determined for use in the subsequent calibration of the rf channel.
For example, the period for performing the update may be one week or 24 hours, or the like.
In the radio frequency channel calibration method provided by the embodiment of the present invention, a calibration signal is sent by a calibration antenna connected to a first radio frequency module, the calibration signal is received by at least two calibrated antennas connected to a second radio frequency module, a device phase difference of each radio frequency channel is determined, and calibration of the radio frequency channel is achieved based on the device phase difference of each radio frequency channel, so that a radio frequency channel of another radio frequency module is calibrated by one radio frequency module of a plurality of radio frequency modules of a wireless device, and calibration before delivery is not limited. In addition, when the calibration is not carried out, the wireless device can normally communicate by using the plurality of radio frequency modules, and the complexity of the wireless device is not increased. In addition, when the radio frequency channel is calibrated, the influence of the difference of the distance between the antenna and the antenna on the phase is considered, and the calibration accuracy is improved.
Finally, it should be noted that: the above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A wireless device is characterized by comprising a first radio frequency module, a second radio frequency module and a processor, wherein the first radio frequency module and the second radio frequency module work in the same frequency band; wherein the content of the first and second substances,
the first radio frequency module is connected with a calibration antenna and used for sending a calibration signal by using the calibration antenna;
the second radio frequency module is connected with at least two calibrated antennas and used for receiving the calibration signal by each antenna of the at least two calibrated antennas; the second radio frequency module corresponds to at least two radio frequency channels, the at least two radio frequency channels respectively correspond to the at least two calibrated antennas, and the number of the at least two radio frequency channels is the same as that of the at least two calibrated antennas;
the processor is configured to determine a device phase difference for each of the at least two radio frequency channels, and calibrating the corresponding radio frequency channel by using the device phase difference of each radio frequency channel in the at least two radio frequency channels, wherein the device phase difference is a difference between a receiving phase difference and a distance phase difference of the corresponding radio frequency channel, the receiving phase difference of the corresponding radio frequency channel is the phase difference of the calibration signal received by the corresponding radio frequency channel and the calibration signal received by the reference radio frequency channel, the distance phase difference of the corresponding radio frequency channel is a phase difference obtained by the distance difference of the corresponding radio frequency channel and the channel of the calibration signal, the distance difference of the corresponding radio frequency channel is the difference between the distance from the calibrated antenna corresponding to the corresponding radio frequency channel to the calibration antenna and the distance from the calibrated antenna corresponding to the reference radio frequency channel to the calibration antenna.
2. The wireless device of claim 1,
the processor is further configured to switch a channel in which the first radio frequency module and/or the second radio frequency module operate, where a frequency band in which the first radio frequency module and the second radio frequency module operate includes a plurality of channels.
3. The wireless device of claim 1 or 2, wherein the processor is a baseband chip or a central processing unit.
4. The wireless device of any of claims 1-2, wherein the wireless device comprises a plurality of second radio frequency modules.
5. The wireless device of claim 3, wherein the wireless device comprises a plurality of second radio frequency modules.
6. A method for calibrating a radio frequency channel, the method comprising:
a first radio frequency module of the wireless device sends a calibration signal by using a calibration antenna;
a second radio frequency module of the wireless device receives the calibration signal by using at least two calibrated antennas, wherein the second radio frequency module corresponds to at least two radio frequency channels, and the at least two radio frequency channels correspond to the at least two calibrated antennas respectively, wherein the calibration antennas and the at least two calibrated antennas are located in the wireless device, and the number of the at least two radio frequency channels and the number of the at least two calibrated antennas are the same;
the wireless device determines a device phase difference of each of the at least two radio frequency channels, where the device phase difference is a difference between a receiving phase difference and a distance phase difference of a corresponding radio frequency channel, the receiving phase difference of the corresponding radio frequency channel is a phase difference between the calibration signal received by the corresponding radio frequency channel and the calibration signal received by a reference radio frequency channel, the distance phase difference of the corresponding radio frequency channel is a phase difference obtained from a distance difference of the corresponding radio frequency channel and a channel of the calibration signal, and the distance difference of the corresponding radio frequency channel is a difference between a distance from a calibrated antenna corresponding to the corresponding radio frequency channel to the calibration antenna and a distance from a calibrated antenna corresponding to the reference radio frequency channel to the calibration antenna;
and the wireless equipment calibrates the corresponding radio frequency channel by using the device phase difference of each radio frequency channel in the at least two radio frequency channels.
7. The method of claim 6, further comprising:
the wireless device switches channels of the first radio frequency module and the second radio frequency module; the frequency band in which the first radio frequency module and the second radio frequency module operate includes a plurality of channels.
8. The method of claim 6 or 7, wherein the wireless device comprises a plurality of second radio frequency modules, and wherein after the first radio frequency module of the wireless device transmits the calibration signal using the calibration antenna, the method further comprises:
each radio frequency module in the plurality of second radio frequency modules receives the calibration signal by using at least two calibrated antennas, wherein each radio frequency module corresponds to at least two radio frequency channels;
the wireless equipment determines the device phase difference of each radio frequency channel in at least two radio frequency channels corresponding to each radio frequency module;
and the wireless equipment calibrates the corresponding radio frequency channel by using the device phase difference of each radio frequency channel in at least two radio frequency channels corresponding to each radio frequency module.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610901193.7A CN107959533B (en) | 2016-10-17 | 2016-10-17 | Wireless device and radio frequency channel calibration method |
| US15/784,940 US9992776B2 (en) | 2016-10-17 | 2017-10-16 | Wireless device and radio frequency channel calibration method |
| EP17196691.4A EP3309980B1 (en) | 2016-10-17 | 2017-10-16 | Wireless device and radio frequency channel calibration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610901193.7A CN107959533B (en) | 2016-10-17 | 2016-10-17 | Wireless device and radio frequency channel calibration method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107959533A CN107959533A (en) | 2018-04-24 |
| CN107959533B true CN107959533B (en) | 2020-11-06 |
Family
ID=60119914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610901193.7A Active CN107959533B (en) | 2016-10-17 | 2016-10-17 | Wireless device and radio frequency channel calibration method |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US9992776B2 (en) |
| EP (1) | EP3309980B1 (en) |
| CN (1) | CN107959533B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10673506B1 (en) | 2018-03-09 | 2020-06-02 | Quantenna Communications, Inc. | Adaptive spatial diagnostics in a wireless network |
| KR102388027B1 (en) * | 2018-12-26 | 2022-04-19 | 삼성전자 주식회사 | A method for testing a wireless communication module, and an electronic device including the wireless communication module |
| CN114026802B (en) | 2019-06-28 | 2023-01-06 | 华为技术有限公司 | Device for correcting deviation among multiple transmission channels and wireless communication equipment |
| CN114041268B (en) * | 2019-06-28 | 2023-06-27 | 华为技术有限公司 | Transmission channel calibration device and wireless communication equipment |
| CN113067590B (en) * | 2019-12-30 | 2022-09-23 | 华为技术有限公司 | Wireless device, method and related equipment |
| CN113466840B (en) * | 2020-03-30 | 2022-09-20 | 阿里巴巴集团控股有限公司 | Distance measurement method, positioning method, device, equipment and system |
| CN112994808B (en) * | 2021-05-20 | 2021-07-27 | 成都天锐星通科技有限公司 | Radio frequency signal internal calibration system and phased array antenna |
| CN113872645B (en) * | 2021-11-18 | 2024-03-15 | 上海创远仪器技术股份有限公司 | Method for realizing reciprocity calibration of MIMO channel simulator |
| CN118191438A (en) * | 2023-11-02 | 2024-06-14 | 成都德辰博睿科技有限公司 | Test signal parameter determining method and system for electromagnetic environment monitoring |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6034987A (en) * | 1996-12-17 | 2000-03-07 | Ericsson Inc. | System for improving the quality of a received radio signal |
| JP4405331B2 (en) * | 2004-07-06 | 2010-01-27 | 富士通株式会社 | Wireless receiver, wireless transmitter, and calibration method |
| CN1320837C (en) | 2004-07-19 | 2007-06-06 | 北京信威通信技术股份有限公司 | Real-time automatic calibrating method and system for radio base station array channel in SCDMA system |
| FI20065841A0 (en) * | 2006-12-21 | 2006-12-21 | Nokia Corp | Communication method and systems |
| IL188507A (en) * | 2007-12-31 | 2012-06-28 | Elta Systems Ltd | Phased array antenna having integral calibration network and method for measuring calibration ratio thereof |
| JP5051385B2 (en) | 2008-05-16 | 2012-10-17 | 日本電気株式会社 | Wireless communication apparatus using array antenna, calibration method thereof, and wireless communication base station system |
| CN101604991B (en) | 2008-06-13 | 2013-01-02 | 展讯通信（上海）有限公司 | Method and device for estimating radio-frequency channel parameters in multiple input multiple output (MIMO) system |
| JP4544352B2 (en) * | 2008-07-23 | 2010-09-15 | ソニー株式会社 | Wireless communication apparatus, wireless communication method, and computer program |
| US7855681B2 (en) * | 2008-11-19 | 2010-12-21 | Harris Corporation | Systems and methods for determining element phase center locations for an array of antenna elements |
| CN102217210A (en) * | 2011-05-31 | 2011-10-12 | 华为技术有限公司 | Method, apparatus, system for signal emission |
| JP6164867B2 (en) * | 2013-02-21 | 2017-07-19 | キヤノン株式会社 | Solid-state imaging device, control method thereof, and control program |
| US20140242914A1 (en) * | 2013-02-22 | 2014-08-28 | Samsung Electronics Co., Ltd. | Method and apparatus for calibrating multiple antenna arrays |
| CN103701535B (en) * | 2013-12-12 | 2019-02-01 | 安弗施无线射频***（上海）有限公司 | Adjust the method and device of intelligent antenna calibration plate |
| US10056685B2 (en) | 2014-03-06 | 2018-08-21 | Samsung Electronics Co., Ltd. | Antenna array self-calibration |
-
2016
- 2016-10-17 CN CN201610901193.7A patent/CN107959533B/en active Active
-
2017
- 2017-10-16 US US15/784,940 patent/US9992776B2/en active Active
- 2017-10-16 EP EP17196691.4A patent/EP3309980B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3309980B1 (en) | 2020-08-26 |
| US9992776B2 (en) | 2018-06-05 |
| US20180110038A1 (en) | 2018-04-19 |
| EP3309980A1 (en) | 2018-04-18 |
| CN107959533A (en) | 2018-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107959533B (en) | Wireless device and radio frequency channel calibration method | |
| US11770174B2 (en) | Millimeter wave beam tracking and beam sweeping | |
| EP4018553A1 (en) | Coverage enhancement for distributed antenna systems and repeaters by time-division beamforming | |
| EP3320629B1 (en) | Method and apparatus for calibration in radio frequency module | |
| JP2015149765A (en) | System and method for tuning antenna of wireless communication device | |
| US20120040685A1 (en) | Method and apparatus for a buffering scheme for otdoa based location positioning | |
| CN110582949A (en) | angle of arrival estimation in a radio communications network | |
| US11290158B2 (en) | Signaling RX/TX beamforming linkage for MIMO systems | |
| WO2018187145A1 (en) | Apparatus, system and method of multi user (mu) ranging measurement with uplink (ul) sounding groups | |
| WO2021012981A1 (en) | Methods and apparatuses of sounding reference signal transmission | |
| EP4071932A1 (en) | Method and apparatus for calibrating phased array antenna | |
| WO2018048775A2 (en) | Apparatus, system and method of ranging measurement | |
| CN109842890B (en) | Signal measurement method, related device and system | |
| US11109261B2 (en) | Antenna port mapping method and network device | |
| CN108430090B (en) | Method for determining and determining DOA, access network equipment and terminal | |
| WO2019192711A1 (en) | Communication devices for efficient beam management | |
| CN103475395A (en) | Antenna correction method, device and system | |
| US9413444B2 (en) | Radio-frequency processing circuit and related wireless communication device | |
| EP1496567A1 (en) | Arrangement for calibrating transmission and/or reception of signals in a radio communications system | |
| CN106788567B (en) | Data transmission device, system and method | |
| Müller et al. | Ultrawideband 3D mmWave channel sounding for 5G | |
| CN109196792A (en) | channel correcting method, device and communication system | |
| CN112235028B (en) | CSI automatic accurate calibration system for commercial WiFi signals | |
| CN111965597A (en) | Combined array direction-finding device, system and method | |
| EP3323208B1 (en) | Method and apparatus for an access point in a point to multipoint wireless network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |